Hi Stefan,
also when your dagger seems to be not very old I don't think that it is a "tourist" knife. This daggers are often described as Bedja dagger but beside from the Bedja this sort of dagger is found by the Hadendoa (Fuzzi Wuzzi), Beni Amer and Tigre in Ethiopia and Sudan.
See also here:
http://www.vikingsword.com/vb/showth...light=Hadendoa A very informative thread regarding this daggers.
See also panga na visu from Manfred A. Zirngibl & Alexander Kubetz, page 244-5.
Best regards,
Detlef